I'm looking to find (or otherwise establish) an authoritative list of Data URL Safe characters in 2020.
I've found older references on the web regarding which characters may or may not be Data URL Safe, most notably this one from late 2012:
but I'm guessing it may be a little out of date given that it recommends encoding spaces and commas (?) and I'm fairly certain that these are both fairly safe to include in a Data URL today. (Although I may be wrong about this...)
Here is my current list of Data URL Safe characters:
Are there any more Data URL Safe characters which ought to be on the list above but aren't?
Conversely, are there any characters on the list above which really are not safe to be included in a Data URL?